Lawn-mower.



T. ROWE.

LAWN MOWER.

APPLICATION FILED JUNE 2a, 1908.

905,591 Patented Dec. 1, 1908.

- of an ordinaryformof lawn mower'illustaching the blade to the carrier D. In lawn -niowers as at present constructed the blades properly cut the grass.

' eled at both edges e, e, as shown in Figs. 3

' the frame C. 4

hang as shown, and; ,"the

'THQMAS ROWE, or WYNNEWOOD, PENNSYLVANIA.

' "Lawn-mom.

Specification of Letters Patent. Application filed June 23, 1908. Serial No. 439,972.

Patelited'nec. 1, 1908.

To all whom it may-concern:

Be it known that I, THoMAs Rown, a citizen of the United States, residingin Wynne-v wood, Pennsylvania, have invented certain Improvements in' Lawn-Mowers, of which the following is a specification.

The object of my invention is to improve the construction of the cutting mechanism of a lawn mower so that it will cut more evenly and can be shifted or replaced when it is necessary to renew the cutting edge. Referring to the accompanylng draw 1ng:F1gu re 1, 1s a transverse sectional view trating my invention; Fig. 2, is a plan view of the lower blade and its carrier detached; Fig. 3, is a perspective view of my improved blade; Fig. 4, isan enlarged diagrammatic sectional View; Fig. 5, is a view 0 a modification; and Fig. 6, is a diagrammatic view showing the action of the worn blade.

A is the main shaft of a lawn mower and a is one of the traction wheels. B is a rotary knife having blades 6. v D' is the fixed knife carrier-pivoted. at d to the side frame 0 and this knife carrier canbe adjusted by screws (1' in the ordinary manner so as to brin the knife in cutting relation to the blades c is the roller mounted at the rear end of The above described mechanism is common in thisty'pe of lawn mower. My invention relates'particularly. to the fixed blade or knife and the mechanism devised is for atwear away very rapidly and it is impossible to adjust them so-as to bring them up to the true cutting position and enable the lawn mower to operate without undue frlctlon and Mounted on the carrier D is a blade E bevand 4. This blade is clamped between a projection d on the carrier D and a plate F confined to the carrier by a series of screws f. The plate can'be of any'width desired and is preferably of such width-that itw ll allow a certain proporti not heblade'E too'ververy thin and of high temperedisteel. sothat itwill have a certain amount; of sp', ,"al lowing it to-bear against thefblades b with a yielding pressure. Y

I The blade E can rotating. fixed carrier, a thin knife'blade beveled on the cutting edge, a clamp plate,- screws for.

The blade is simply a straight blade extending from one side of the lawn mower to the other and is beveled at both edges and, as shown in Fig. 3, the bevel of the cutting edge is on the lower side of the blade so as to present to the knives a shar edge and there will be practically no sur ace against which theblades b mnst rub.-

As soon as the blade E commences to wear and roduce a friction surface, as shown in theiagram, Fig. 6, it can be inverted or turned edge for edge, as desired.

' The screws of the. clamp do not through the blade as in lawn mowers o the usual constructionso that the blades can be carried in stock and readily applied when the one in use is completely worn away. I

be set on the carrier so that-its inner edge will rest against the screws f, thus alining the blade properly withthe carrier but this is not absolutely essential.

In some instances wherealinement is desired,- es cially' on lar preferab y notch the bla and provide slides H having projections which enter the notches. The slides are secured to the frame by screws h which pass through slots in the slides. By ad'usting the'slides the blade E can'be broug t into proper alinement with the blades 1) and then clamped by the screws f and the plate F.

e lawn mowers, I e E at i at each end I claim p 4 v 1. The combination in a lawn mower of a rotating knife havin a series of blades, a' fixed carrier mounte in close roximity to the rotating knife, :1 blade ma e of spring metal and having a beveled edge, and a clamp for securing the blade firmly to the carrier throughout its length, said blade extending beyond the clamp and carrier asuflicient distance to allow it to bear against the blades of the rotating knife with a yielding pressure.

2. The combination in a lawn mower, of a rotating knife. having a series of blades, a.

fixed carrier, a thin blade beveled at both edges, a clamp plate, and screws for clamping theblade to the carrier, said screws passing through the clamp plate and clear of the blade.

3., The combination'in a lawn mower, 'ofa nife having a series of blades, a

clamping the knife blade to the carrier, said I V In testimony whereof, I have signed my blade being notched at each end, and slides name to this specification, in the presence of adjustably secured to the carrier and entertwo subscribing witnesses.

ing the notches in the blade. THOMAS ROWE.

4. A flat knife blade for a lawn mower Witnesses: made of s ring metal having both edges Jos. H. KLEIN,

beveled an notched at each end. WM. A. BARR. 

